Item 6E13 SOUTHLAI<,,E
CITY OF
Department of Planning & Development Services
,�a drill 0 =:7No 1•] :aI
April 27, 2011
PROJECT: Variance to Lighting Ordinance for Carroll Independent School District
EXECUTIVE
SUMMARY: Hart, Gaugler & Associates, Inc., on behalf of Carroll Independent School District, is
requesting approval of a variance to the Lighting Ord. No. 693 -B, to permit the use
of light- emitting diode (L.E.D.) type lighting in place of high pressure sodium lights
at all Carroll Independent School District (CISD) campuses and facility locations
within the City of Southlake.
REQUEST
DETAILS: Hart, Gaugler & Associates, Inc., on behalf of Carroll Independent School District
(CISD), is requesting a variance to the Lighting Ordinance No. 693 -B for all CISD
campuses and facilities to use L.E.D. lighting and has provided a letter under
Attachment `C' of this staff report to support this request. The Lighting Ordinance
requires that all light sources on poles over 42- inches in height and exterior wall
mounted light fixtures shall be high pressured sodium lights or other lights that give
a similar soft lighting effect. Six photometric studies are attached for the new
schools and expansions that are currently underway and for Dragon stadium. The
applicant is requesting a variance for all the CISD campuses and facilities to allow
the use of L.E.D. lighting at the remaining campuses in the future. The applicant
has also indicated all other requirements of the Lighting Ordinance shall be met.
Lance Morrow, P. E. with Romine, Romine and Burgess, Inc. has provided technical
documents to the applicant with the following comments, which were then
forwarded to staff. Additional comments from Mr. Morrow can be found in
Attachment C.
Here are some documents explaining the effectiveness of the whiter
color of light as far as how the eye perceives it and how light meters, as
they are manufactured today, are not set up to correctly measure light as
we perceive it. These articles explain the ineffectiveness of the
yellow /orange high pressure sodium light as far as performance and
relative energy efficiency is concerned. I do believe that high pressure
sodium will go away in time but I don't know how soon. Almost all
research money is being put into LED right now by the manufacturers so
performance and efficiency will continue to increase and cost will
continue to come down. Link to Technical Documents
ACTION NEEDED: 1) Consider Variance Request to Lighting Ordinance
ATTACHMENTS: (A) Background Information
(B) Vicinity Map
(C) Variance Request Letter & Plan Exhibits — Link to PowerPoint
STAFF CONTACT: Dennis Killough (817) 748 -8072
Richard Schell (817) 748 -8602
BACKGROUND INFORMATION
OWNER/APPLICANT: Carroll Independent School District
PROPERTY SITUATION: 500 S. Kimball Ave.
LAND USE CATEGORY: Public /Semi - Public, Mixed Use, Medium Density Residential, Low Density
Residential, Office Commercial & 100 -Year Flood Plain
CURRENT ZONING: Multiple Zoning Districts
PLANNING & ZONING
COMMISSION ACTION: March 24, 2011; Approved (7 -0) as presented in the staff report dated
March 18, 2011.
CITY COUNCIL ACTION: April 5, 2011; Approved (6 -0) a motion to table the item to the April 19, 2011
meeting.
April 19, 2011; Approved on consent (7 -0) to table the item to the May 3,
2011 meeting.
STAFF COMMENTS: Staff does note that the applicant has indicated that all other requirements
of the Lighting Ordinance No. 693 -B shall be met.
Attachment B
Page 1
Vicinity . •
Carroll Independent School District
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Attachment B
Page 1
A Hart, Gaugler & Associates, Inc.
Civil & Structural Engineering
O O
March 7, 2011
Mr. Dennis Killough
City of Southlake
Department of Planning
1400 Main Street, Suite 310
Southlake, TX 76092
Re: Carroll Independent School District
Lighting Narrative
Dear Dennis:
Lighting Ordinance No. 693 -B provides for luminaries on poles over 42 inches in height to be
high pressured sodium lights or other lights giving a similar soft lighting effect. The ordinance
was adopted in 1999 when high pressured sodium lights were considered state of the art and an
energy efficient lighting option. One of the purposes of the ordinance is stated in Section 1.
Purpose, paragraph (e) "promote efficient design and operation with regard to energy
conservation'.
We are requesting approval to use an LED light source in lieu of the high pressured sodium
mandated in the lighting ordinance on all CISD properties. Other aspects of the lighting
ordinance will be followed. The main advantages of the LED light source are:
• Energy efficiency — A more even illumination pattern can be achieved across an area with
much less wattage and lumens of light because each individual LED is aimed at a different
angle to hit a different spot. Lumens per watt is meaningless when comparing LED to
HID (high pressure sodium or metal halide) because of this. In turn, the LED may utilize
as much as 75% less wattage than the HID to accomplish the same lighting layout.
• Long Life — Maintenance costs are significantly reduced with the 50,000 to 100,000 hour
life of the LED. The LED continues to illuminate beyond this time frame, just at a light
level under 70% or so of the initial level.
• Glare and Light Trespass Control — Problems with glare and light trespass are reduced
because of the lower wattages/lumens. These lights will not exceed any of the maximum
on -site or off -site illumination regulations of the ordinance.
• Silent Operation — No buzzing or humming like the ballasted HID.
• Durability — No worries with lamp breakage due to vibration or vandalism.
• Smaller fixture size — Smaller, thinner fixtures are more aesthetic and less susceptible to
wind.
Photometric information is provided for the following properties:
1. Johnson Elementary School Addition
2. Carroll Elementary School Addition
3. New Elementary School #5
4. New Middle School
5. CISD Senior High School Addition
6. Dragon Stadium Addition
12801 N. Central Expressway • Suite 1400 • Dallas, TX 75243 • Voice 972- 239 -5111 • Fax 972 - 239 -5055
Attachment C
Page 1
HGA Hart, Gaugler & Associates, Inc.
Civil & Structural Engineering
A O
Please feel free to contact us with any questions you may have as you review this request.
Sincerely,
Hart, Gaugler & Associates, Inc.
John D. Blacker, P.E.
Principal
RVM7t2W(ACiviASUbmittebLM11 -03.M formalsubi iltab2011.0307_M- fighting NARRATIVE- SOUTHIAU. final.doc
12801 N. Central Expressway • Suite 1400 • Dallas, TX 75243 • Voice 972- 239 -5111 • Fax 972- 239 -5055
Attachment C
Page 2
Additional Comments from Lance Morrow, P.E.
Romine, Romine and Burgess, Inc.
As for information on the internet, one could spend weeks reading about LED /HID comparisons
and LED literature from the countless number of different manufacturers. Most manufacturers
now offer many of their fixture types in the LED light source now. Here are some links to get to
some of the main lighting manufacturers that supply light fixtures for commercial construction
projects:
http: / /www.hubbelilighting.com/
http: / /www.kimlighting.com/
http: / /www.sternberglighting.conVied terminology/
http: / /www.cooperindustries.com /content /public /en /lighting.html
http://www.lithonia.com/
The excerpt below is a good resource since the test projects are being performed by the US
Dept. of Energy. I have attached several different DOE projects along with some other
information that will be informative.
DOE releases Gateway report on Palo Alto roadway lighting
15 Jun 2010
The U.S. Department of Energy (DOE) released findings from a recent roadway lighting project,
which pitted LED, HPS and induction luminaries against one another.
The US Department of Energy (DOE) has published the final report from a roadway lighting
demonstration conducted in Palo Alto, California, to evaluate the feasibility of replacing high -
pressure sodium (HPS) streetlights with LED and induction streetlights. The report is the tenth in
a series, all of which can be downloaded from the Gateway website.
In this project, three groups of HPS streetlights were replaced — four with one type of LED
luminaire, three with another type of LED luminaire, and three with induction luminaires —
allowing comparisons between the three groups as well as to the existing technology.
In addition, two LED and two induction luminaires were installed on a commercial street in the
center of Palo Alto to test a remote streetlight monitoring system. These luminaires were
equipped with Echelon communication hardware that can be remotely controlled through a
desktop or laptop personal computer. These luminaires were programmed to turn on and off on
a schedule similar to that of the streetlight luminaires controlled by a photocell but then were
dimmed by 25% of full power for 5 hours each evening.
This report provides an overview of project results including lighting performance, economic
performance, and potential energy savings.
Key findings include:
• Of the three roadway lighting systems (induction, HPS, and LED), LED used the least
energy (44% reduction compared to the baseline HPS) and provided comparable average
illuminance on the street.
• LED luminaires produced more uniform light output than HPS or induction luminaires,
and had better cutoff on the curbside, resulting in significantly reduced light trespass onto
residential properties.
Attachment C
Page 3
• Simple payback for retrofitting a 70 -watt (nominal) H PS with an LED luminaire was
estimated to be around 12 years, improving to about 10 years in anew construction scenario.
Community feedback was obtained during this study, and overall results from respondents show
a marked preference for LED lights over induction lights. Nevertheless, two common concerns
related to LED lights were excessive glare and the perceived bluelcold color of the LED light
output. These issues will have to be resolved prior to a mass rollout of LED streetlights for Palo
Alto. The LED luminaires tested in the demonstration have a correlated color temperature (CCT)
of 6000K; by comparison, the CCT for the induction and H PS streetlights were 5000K.
Attachment C
Page 4
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Attachment C
Page 5
DRAGON STADIUM
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Attachment C
Page 6
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Attachment C
Page 6
JOHNSON ELEMENTARY SCHOOL
Attachment C
Page 7
NEW CARROLL ELEMENTARY SCHOOL
ED
Attachment
Page
NEW CARROLL MIDDLE SCHOOL
Attachment C
Page 9
CARROLL SENIOR HIGH SCHOOL
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Attachment C
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